| 1 | using System;
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| 2 | using System.Collections.Generic;
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| 3 | using System.Globalization;
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| 4 | using System.Linq;
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| 5 | using System.Text;
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| 6 | using OfficeOpenXml.FormulaParsing.ExpressionGraph;
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| 7 |
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| 8 | namespace OfficeOpenXml.FormulaParsing.Excel.Functions.DateTime
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| 9 | {
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| 10 | public class Weeknum : ExcelFunction
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| 11 | {
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| 12 | public override ExpressionGraph.CompileResult Execute(IEnumerable<FunctionArgument> arguments, ParsingContext context)
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| 13 | {
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| 14 | ValidateArguments(arguments, 1, eErrorType.Value);
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| 15 | var dateSerial = ArgToDecimal(arguments, 0);
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| 16 | var date = System.DateTime.FromOADate(dateSerial);
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| 17 | var startDay = DayOfWeek.Sunday;
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| 18 | if (arguments.Count() > 1)
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| 19 | {
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| 20 | var argStartDay = ArgToInt(arguments, 1);
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| 21 | switch (argStartDay)
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| 22 | {
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| 23 | case 1:
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| 24 | startDay = DayOfWeek.Sunday;
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| 25 | break;
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| 26 | case 2:
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| 27 | case 11:
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| 28 | startDay = DayOfWeek.Monday;
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| 29 | break;
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| 30 | case 12:
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| 31 | startDay = DayOfWeek.Tuesday;
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| 32 | break;
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| 33 | case 13:
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| 34 | startDay = DayOfWeek.Wednesday;
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| 35 | break;
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| 36 | case 14:
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| 37 | startDay = DayOfWeek.Thursday;
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| 38 | break;
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| 39 | case 15:
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| 40 | startDay = DayOfWeek.Friday;
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| 41 | break;
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| 42 | case 16:
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| 43 | startDay = DayOfWeek.Saturday;
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| 44 | break;
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| 45 | default:
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| 46 | // Not supported
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| 47 | ThrowExcelErrorValueException(eErrorType.Num);
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| 48 | break;
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| 49 | }
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| 50 | }
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| 51 | if (DateTimeFormatInfo.CurrentInfo == null)
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| 52 | {
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| 53 | throw new InvalidOperationException(
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| 54 | "Could not execute Weeknum function because DateTimeFormatInfo.CurrentInfo was null");
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| 55 | }
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| 56 | var week = DateTimeFormatInfo.CurrentInfo.Calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay,
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| 57 | startDay);
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| 58 | return CreateResult(week, DataType.Integer);
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| 59 | }
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| 60 |
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| 61 |
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| 62 | }
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| 63 | }
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